The very first person killed on 9/11 was an MIT student, Daniel Lewin, someone I knew well. Before I moved to a dorm or even considered applying to MIT, I was a resident of Westgate Low-Rise, that collection of squat apartment buildings past Next House clustered around a playground. My mother was a graduate student in Course 11 in the late 1990s; Daniel and his young family lived in the apartment above mine. He became a second dad to me after my father was felled by a brain tumor, but my relationship with him was not unique. He was widely loved here on campus.